Business has its ups and downs, and so, naturally, do women in business. (Bye-bye, Martha!) But the story of this list is one of achievement: The credentials of these women,
including the 13 newcomers, are the strongest yet.

Since joining the company in 2000, Poon has kept adding responsibilities. In addition to leading the pharma division, she oversees procurement, information management, and
operations at the $57.1 billion company.